sed quick reference

Continuing on this idea of quick references^[1] to aid my memory, the next one is
sed: stream editor for filtering and transforming text

My favourite busybox toolkit contains sed too.

"-i" to edit files in place. Test first without this option.

'1d'	delete 1st line
'5d'	delete 5th line
'1,5d'	delete lines 1 to 5
'1d;5d'	delete lines 1 and 5
'$d'	delete last line
'/pattern/d'	delete all lines containing pattern
'/pattern/!d'	delete all lines not containing pattern
'/^$/d'	delete all empty lines

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[1] vi quick reference